I have been working on the notes in a book on and off for months now. I haven’t edited it in maybe a month, but when I start working on it I notice that I am missing over a dozen of my latest annotations. I know because I still have the images on my ipad Photos app that were included with those notes. What happened? Hours of work is lost, and I have rewritten half of the notes now, but I am wondering where the others went. I am afraid to look in other books I had also worked on in the previous months. How can I make sure that a book is backed up. Can I back up to Google Drive? Dropbox? Microsoft OneDrive? Evernote? How about just saving it to my iPad Files folder?
Where can I do this and see when my last backup was?